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Attention, chocolate lovers: You may not be able to help yourselves. Swiss and British scientists have linked the widespread love of chocolate to a chemical "signature" that may be programmed into our metabolic systems.
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Pain
Pain: It may seem ludicrous to define a sensation that most everyone has experienced (except, for example, people born with complete insensitivity to pain). One standard reference work defines pain as a "more or less localized sensation of discomfort, distress, or agony, resulting from the stimulation of specialized nerve endings."